TY - CHAP
T1 - Hypocenter migration and crustal seismic velocity distribution observed for the inland earthquake swarms induced by the 2011 Tohoku-Oki earthquake in NE Japan
T2 - Implications for crustal fluid distribution and crustal permeability
AU - Okada, Tomomi
AU - Matsuzawa, Toru
AU - Umino, Norihito
AU - Yoshida, Keisuke
AU - Hasegawa, Akira
AU - Takahashi, Hiroaki
AU - Yamada, Takuji
AU - Kosuga, Masahiro
AU - Takeda, Tetsuya
AU - Kato, Aitaro
AU - Igarashi, Toshihiro
AU - Obara, Kazushige
AU - Sakai, Shinichi
AU - Saiga, Atsushi
AU - Iidaka, Takashi
AU - Iwasaki, Takaya
AU - Hirata, Naoshi
AU - Tsumura, Noriko
AU - Yamanaka, Yoshiko
AU - Terakawa, Toshiko
AU - Nakamichi, Haruhisa
AU - Okuda, Takashi
AU - Horikawa, Shinichiro
AU - Katao, Hiroshi
AU - Miura, Tsutomu
AU - Kubo, Atsuki
AU - Matsushima, Takeshi
AU - Goto, Kazuhiko
AU - Miyamachi, Hiroki
N1 - Publisher Copyright:
© 2017 by John Wiley & Sons Ltd. All rights reserved.
PY - 2016/10/31
Y1 - 2016/10/31
N2 - After the occurrence of the 2011 magnitude 9 Tohoku earthquake, seismicity in the overriding plate changed. This chapter considers some possible evidence of the influence of crustal fluid/water on the occurrence of the triggered seismicity after the 2011 Tohoku-Oki earthquake. It estimates the permeability from the observed hypocenter diffusion. Shallow seismic activity and crustal deformation are strongly affected by the water dehydrated and upwelling from the subducting Pacific plate. Spatiotemporal expansion of hypocenter areas of some earthquake swarms can be attributed to fluid diffusion. In the upper crust, the earthquakes seem to be distributed in seismic high-velocity areas rather than in seismic low-velocity areas. In the lower crust, the seismic low-velocity areas appear to be elongated along N-S or NE-SW, the strike of the island arc. The chapter also estimates three-dimensional seismic velocity structure using the double-difference tomography method.
AB - After the occurrence of the 2011 magnitude 9 Tohoku earthquake, seismicity in the overriding plate changed. This chapter considers some possible evidence of the influence of crustal fluid/water on the occurrence of the triggered seismicity after the 2011 Tohoku-Oki earthquake. It estimates the permeability from the observed hypocenter diffusion. Shallow seismic activity and crustal deformation are strongly affected by the water dehydrated and upwelling from the subducting Pacific plate. Spatiotemporal expansion of hypocenter areas of some earthquake swarms can be attributed to fluid diffusion. In the upper crust, the earthquakes seem to be distributed in seismic high-velocity areas rather than in seismic low-velocity areas. In the lower crust, the seismic low-velocity areas appear to be elongated along N-S or NE-SW, the strike of the island arc. The chapter also estimates three-dimensional seismic velocity structure using the double-difference tomography method.
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U2 - 10.1002/9781119166573.ch24
DO - 10.1002/9781119166573.ch24
M3 - Chapter
AN - SCOPUS:85019435471
SN - 9781119166566
SP - 307
EP - 323
BT - Crustal Permeability
PB - wiley
ER -